JP5223525B2 - Boiler water supply system - Google Patents

Description

  The present invention relates to a water supply system for a boiler. In particular, drainage from steam-utilizing equipment is collected in the water supply tank to increase the temperature of the water supply to the boiler, while the water supplied to the boiler is used to recover the compression heat of the compressor and supply water to the boiler. The present invention relates to a boiler water supply system that can effectively increase the temperature and cool the compressor oil.

Patent Document 1 below discloses a steam system including a screw expander (1) that generates power using steam and an air compressor (2) driven by the screw expander (1). Yes.
JP-A-63-45403

  The compressor generates heat of compression during operation. In the case of an oil-lubricated compressor, if the temperature of the lubricating oil is too high, the viscosity of the lubricating oil decreases, causing film breakage or inconvenience for air to expand and compress. On the other hand, if the temperature of the lubricating oil is too low, the viscosity of the lubricating oil increases, and power is required to drive the compressor. Therefore, it is necessary to maintain the temperature of the lubricating oil as desired.

  In the case of a steam system including a screw type expander and an air compressor as in the invention disclosed in the patent application 1, it is assumed that a boiler is further provided for supplying steam to the screw type expander. The In that case, in order to cool the compressor, it may be considered to use water supply to the boiler. However, since the water supply to the boiler is intermittently performed, there is a possibility that the compressor cannot be effectively cooled only by using the water supply to the boiler.

  Even if the water stored in the water supply tank and the lubricating oil of the compressor are circulated to the heat exchanger and indirectly heat exchanged, the temperature of the lubricating oil cannot be maintained as desired. In addition, when drainage from steam-utilizing equipment such as a screw expander is collected in the water supply tank to save energy, the temperature of the water in the water supply tank rises, so that the temperature is not suitable for compressor cooling water. There is also a risk.

  The problem to be solved by the present invention is to recover the compression heat of the compressor using the water supplied to the water supply tank while recovering the drainage from the steam utilization equipment to the water supply tank to increase the temperature of the water supply to the boiler. Then, it is providing the boiler water supply system which can aim at effectively the temperature rise of the feed water to a boiler, and cooling of the oil of a compressor.

This invention was made in order to solve the said subject, and invention of Claim 1 stores the water supply to a boiler, and is a water supply tank with which the steam drain from a boiler is collect | recovered, and this water supply The water supply to the tank is provided so that water can be supplied to the water supply tank based on the water level in the water supply tank, but water is supplied between the supply water tank that is not supplied from the water supply tank and the supply water tank A heat exchanger that is circulated and through which the liquid to be cooled with the circulating water is passed, a heat exchange water pump provided in a water supply path from the makeup water tank to the heat exchanger, and the heat exchange A boiler water supply system comprising: a heat supply water amount adjusting means for adjusting the amount of water supplied from the heat supply water supply pump to the heat exchanger based on a liquid temperature of the liquid to be cooled that is passed through the vessel. .

  According to the first aspect of the present invention, it is possible to save energy by collecting the drain from the steam utilization device to the water supply tank. Further, a makeup water tank is provided separately from the water supply tank, and the liquid to be cooled can be cooled with the water in the makeup water tank. By providing a make-up water tank separately from the water supply tank, even if drain is collected in the water supply tank, the temperature of the water in the make-up water tank is not thereby raised. Thereby, even if the water in the water supply tank rises in temperature due to the collected drain, the liquid to be cooled can be cooled with the water in the makeup water tank. Moreover, the liquid to be cooled can be brought to a desired temperature by adjusting the amount of water supplied from the heat exchange water pump to the heat exchanger based on the liquid temperature of the liquid to be cooled. Furthermore, since the water in the make-up water tank is supplied to the water supply tank, the heat obtained from the liquid to be cooled can be used effectively.

  According to a second aspect of the present invention, there is provided a replenishment water valve provided in a replenishment water passage from the replenishment water tank to the water supply tank, and opened and closed based on a water level in the water supply tank, and A branch valve that branches from the makeup water path to the makeup water tank, and further includes a return valve that is opened when the makeup water valve is closed, and the makeup water valve is composed of an electromagnetic valve, The return valve is a check valve that opens when the replenishing water valve is closed to reach a valve opening pressure, and allows water from the replenishing water tank to be returned to the replenishing water tank again. It is a boiler water supply system of Claim 1 characterized by these.

  According to the second aspect of the present invention, the water in the makeup water tank is supplied to the water supply tank via the electromagnetic valve or returned to the makeup water tank via the check valve. Such alternative control can be easily performed simply by controlling the opening and closing of the solenoid valve.

  According to a third aspect of the present invention, the heat supply water amount adjusting means is an inverter that controls the number of rotations of the heat supply water pump based on the liquid temperature of the liquid to be cooled that is passed through the heat exchanger. The heat exchanger is configured such that water can be circulated to and from the makeup water tank, and lubricating oil as the liquid to be cooled can be circulated to and from an oil lubricated compressor, and the compressor The heat supply water pump is controlled by the inverter to adjust the amount of water supplied from the makeup water tank to the heat exchanger so as to maintain the lubricating oil supplied to the heat exchanger from a set temperature. It is a boiler water supply system of Claim 1 or Claim 2 characterized by these.

  According to the third aspect of the present invention, the lubricating oil of the oil-lubricated compressor can be easily maintained at a desired temperature by inverter-controlling the heat exchange water pump.

  According to a fourth aspect of the present invention, the heat supply water amount adjusting means is configured to supply water from the heat supply water pump to the heat exchanger based on a liquid temperature of a liquid to be cooled that is passed through the heat exchanger. A temperature control three-way valve that adjusts a distribution ratio of returning to the makeup water tank via the heat exchanger or returning to the makeup water tank without going through the heat exchanger, and the heat exchanger is connected to the makeup water tank. The lubricating oil as the liquid to be cooled can be circulated between the oil lubricated compressor and the lubricating oil supplied from the compressor to the heat exchanger. The boiler according to claim 1 or 2, wherein the amount of water supplied from the makeup water tank to the heat exchanger is adjusted by controlling the temperature control three-way valve so as to maintain a set temperature. It is a water supply system.

  According to invention of Claim 4, the lubricating oil of an oil lubrication type compressor can be easily maintained at desired temperature by controlling a temperature control three-way valve.

  According to a fifth aspect of the present invention, the makeup water tank can be supplied with water via a water supply valve, and can be drained with a drain valve, and the water supply valve can receive water in the makeup water tank. When the water level is below the lower limit water level, the drain valve is closed when the upper limit water level is exceeded, and when the water supplied to the heat exchanger exceeds the upper temperature limit, the drain valve is closed. It is a boiler water supply system of any one of Claims 1-4 characterized by the above-mentioned.

  According to the fifth aspect of the present invention, when the water temperature in the makeup water tank rises too much and becomes a temperature unsuitable for cooling the liquid to be cooled, at least a part of the water in the makeup water tank is replaced. Can be achieved.

  Furthermore, in the invention according to claim 6, the inside of the makeup water tank is divided up and down via a partition wall, but the upper region and the lower region are partly communicated with each other in part from the partition wall, Water supply to the make-up water tank through the water supply valve is made to a lower region than the partition wall, while water drained from the make-up water tank through the drain valve is made from an upper region than the partition wall, Water supply from the water tank to the heat exchanger is made in a lower region than the partition wall, while drainage from the heat exchanger to the make-up water tank is made in an upper region than the partition wall, and the make-up water tank The boiler water supply system according to claim 5, wherein water supply to the water supply tank is performed from an upper region than the partition wall.

  According to the sixth aspect of the present invention, the partition wall is provided in the make-up water tank, and a high temperature region and a low temperature region can be created in the water in the make-up water tank. Thus, water supply to the makeup water tank is performed in the low temperature region, drainage from the makeup water tank is performed from the high temperature region, and water supply to the heat exchanger for cooling the liquid to be cooled is performed from the low temperature region. By returning the water warmed in (1) to the high temperature region and supplying water to the water supply tank from the high temperature region, it is possible to maintain the heat exchange capacity and improve the system efficiency.

  According to the boiler water supply system of the present invention, the heat from the compressor is recovered by using the water supplied to the water supply tank while recovering the drainage from the steam-utilizing equipment to the water supply tank and increasing the temperature of the water supply to the boiler. Thus, it is possible to effectively increase the temperature of the feed water to the boiler and cool the oil of the compressor.

  Hereinafter, the boiler water supply system of this invention is demonstrated in detail based on an Example.

  FIG. 1 is a schematic diagram illustrating an example of a steam system 2 including the first embodiment of the boiler water supply system 1 of the present invention. In the steam system 2, the present invention is applied to a water supply system to the boiler 3. Therefore, first, the outline of the steam system 2 in the illustrated example will be described, and then the boiler water supply system 1 of the present embodiment which is a water supply system to the boiler 3 will be described.

  A steam system 2 shown in FIG. 1 includes a boiler 3, a steam engine 4 that generates power using steam from the boiler 3, and a compressor 5 that is driven by the steam engine 4. The steam engine 4 and the compressor 5 may be configured as one unit 6 as indicated by a two-dot chain line in FIG.

  If the boiler 3 is a steam boiler, the structure in particular will not be ask | required. Water is supplied to the boiler 3 from a water supply tank 7 through a water supply pump 8 and a check valve 9. Since the water supply system to the boiler 3 includes the soft water device 10 and the deoxygenation device 11, the degassed soft water is supplied to the boiler 3. The water supplied to the boiler 3 is vaporized by the boiler 3. The steam from the boiler 3 is supplied to the first steam header 12, and the steam of the first steam header 12 is supplied to one or a plurality of various steam utilizing devices 13, 13,.

  One type of steam utilization device is a steam engine 4. Steam is supplied from the first steam header 12 to the steam engine 4 via the steam supply path 14. The steam supply path 14 from the first steam header 12 to the steam engine 4 is provided with a steam supply valve 15 composed of an electromagnetic valve or an electric valve. By controlling the opening / closing or opening of the steam supply valve 15, it is possible to adjust the presence / absence or output of the steam engine 4.

  The steam engine 4 is a device that obtains rotational driving force by the supplied steam. In the steam engine 4, the steam is expanded and decompressed. Therefore, the steam engine 4 functions not only as a drive source for the compressor 5 but also as a pressure reducing valve. Thereby, the steam after use in the steam engine 4 can also be used as it is in various steam utilization devices (not shown) as the steam after passing through the pressure reducing valve. For this purpose, the steam after use in the steam engine 4 is supplied to the second steam header 17 via the exhaust steam passage 16, and the steam in the second steam header 17 is sent to one or a plurality of various steam utilizing devices. Supplied.

  The first steam header 12 and the second steam header 17 are also connected via the bypass path 18. Specifically, the steam supply path 14 from the first steam header 12 to the steam supply valve 15 and the exhaust steam path 16 from the steam engine 4 to the second steam header 17 are connected by a bypass path 18. A bypass valve 19 is provided in the bypass path 18. The bypass valve 19 is preferably a self-powered pressure reducing valve, and its opening degree is mechanically adjusted by itself so as to maintain the steam pressure in the second steam header 17 at a predetermined level.

  The steam engine 4 is preferably a screw-type steam engine. A screw-type steam engine is an apparatus in which steam is introduced between screw rotors that mesh with each other, and the steam is expanded and decompressed while rotating the screw rotor by the steam, and power is obtained by rotation of the screw rotor at that time.

  The compressor 5 is not particularly limited as long as it is oil-lubricated, but is a screw-type air compressor here. A screw compressor is a device that sucks gas between screw rotors that mesh with each other and rotate, and compresses and discharges the gas by rotation of the screw rotor.

  The compressor 5 is driven by the steam engine 4. Specifically, the screw rotor of the screw compressor 5 is rotated using the rotational driving force of the screw rotor of the screw steam engine 4. As described above, the compressor 5 is basically driven by the steam engine 4, but may be auxiliary driven by an electric motor (not shown).

  Next, the boiler water supply system 1 will be described. The boiler water supply system 1 of the present embodiment circulates the water supply tank 7 that stores water supplied to the boiler 3, the replenishment water tank 20 that stores water supplied to the water supply tank 7, and the water in the replenishment water tank 20. A heat exchanger 21 for cooling the compressor 5 is provided as a main part.

  The water supply tank 7 stores water supplied to the boiler 3 and collects drain from the steam utilization device 13 or the like. In FIG. 1, drains from the steam utilization device 13 (including the steam engine 4) of the first steam header 12 and the steam utilization device (not shown) of the second steam header 17 are drain recovery paths 22 and 22, respectively. ,... Are collected into the water supply tank 7. The water in the water supply tank 7 can be supplied to the boiler 3 through the water supply pump 8 and the check valve 9.

  The make-up water tank 20 stores water supplied to the water supply tank 7 and can supply water via the soft water device 10 and the deoxygenation device 11. The soft water device 10 is a device that removes hardness components such as calcium and magnesium contained in raw water using an ion exchange resin or the like. The deoxygenation device 11 is a device that removes oxygen in water using a hollow fiber membrane or the like.

  The raw water is supplied to the makeup water tank 20 as degassed soft water through the soft water device 10 and the deoxygenation device 11. A water supply valve 24 is provided in the water supply path 23 to the makeup water tank 20. By controlling the opening and closing of the water supply valve 24, the presence or absence of water supply to the makeup water tank 20 is switched. In order to prevent oxygen from being dissolved again when the degassed soft water comes into contact with air, beads 25, 25,... Are floated over the water surfaces of the water supply tank 7 and the makeup water tank 20. .

  A water level detector 26 is provided in the makeup water tank 20. By controlling the water supply valve 24 based on the detection signal from the water level detector 26, the inside of the makeup water tank 20 is maintained at a desired water level. The water level detector 26 may be an analog level water level detector, but in this embodiment, a capacitive water level detector capable of obtaining an output proportional to the water level is used. The water supply valve 24 is opened when the water in the makeup water tank 20 falls below the lower limit water level, and is closed when the water exceeds the upper limit water level.

  The water in the makeup water tank 20 can be supplied to the water supply tank 7 through the makeup water channel 27. A makeup water pump 28 and a makeup water valve 29 are provided in the makeup water channel 27 in order from the makeup water tank 20 side. The replenishment water passage 27 is provided with a branch passage 30 from between the replenishment water pump 28 and the replenishment water valve 29 to the replenishment water tank 20. The branch path 30 is provided with a return valve 31 that is opened when the makeup water valve 29 is closed with the makeup water pump 28 operated. The return valve 31 normally closes the branch path 30 in both forward and reverse directions, but reaches the valve opening pressure only when the makeup water valve 29 is closed while the makeup water pump 28 is operated. The check valve is opened to return the water from the makeup water pump 28 to the makeup water tank 20.

  Similar to the makeup water tank 20, the water supply tank 7 is provided with a water level detector 32. By controlling the replenishment water valve 29 based on the detection signal from the water level detector 32, the inside of the water supply tank 7 is maintained at a desired water level. In this embodiment, a capacitance type water level detector 32 capable of obtaining an output proportional to the water level is used, and the makeup water valve 29 is opened when the water in the water supply tank 7 falls below the lower limit water level. It will be closed when the upper water level is exceeded. When the makeup water valve 29 is closed, the return valve 31 is opened so that the water from the makeup water pump 28 is returned to the makeup water tank 20 through the branch path 30.

  As described above, the compressor 5 is an oil lubricated type, more specifically, a screw type air compressor. In this case, lubricating oil is present in the casing in order to lubricate the screw rotors that rotate in mesh with each other in the casing and to form a space for generating compressed air. This lubricating oil also serves to cool the compression heat generated in the compressor 5 by being water-cooled to a desired temperature. Since the lubricating oil is cooled with water and maintained at a desired temperature, the disadvantage that the air to be compressed expands is also avoided.

  Due to such water cooling of the lubricating oil, the lubricating oil of the compressor 5 can be indirectly heat exchanged with the water in the makeup water tank 20 by the heat exchanger 21. Specifically, the heat exchanger 21 is supplied with lubricating oil from the compressor 5 via the supply path 33, and the lubricating oil is returned to the compressor 5 via the discharge path 34. A first temperature sensor 35 is provided in the supply path 33 from the compressor 5 to the heat exchanger 21. On the other hand, a circulation pump 36 is provided in the discharge path 34 from the heat exchanger 21 to the compressor 5. By operating the circulation pump 36, the lubricating oil is circulated between the compressor 5 and the heat exchanger 21.

  The heat exchanger 21 is supplied with water from the make-up water tank 20 through the water supply passage 37, and the water is returned to the make-up water tank 20 through the drainage passage 38. A second temperature sensor 39 and a heat exchange water pump 40 are provided in the water supply path 37 from the makeup water tank 20 to the heat exchanger 21. The heat supply water pump 40 can control the rotation speed by an inverter 41. Thereby, the amount of water supply from the heat exchange water supply pump 40 to the heat exchanger 21 can be adjusted. On the other hand, a check valve 42 is provided in the drainage path 38 from the heat exchanger 21 to the makeup water tank 20.

  The rotation speed of the heat supply water pump 40 is controlled by the inverter 41 based on the liquid temperature of the lubricating oil passed through the heat exchanger 21. Specifically, the heat supply water pump 40 is controlled by the inverter 41 based on the temperature detected by the first temperature sensor 35 so that the lubricating oil supplied from the compressor 5 to the heat exchanger 21 is maintained at a set temperature. Thus, the amount of water supplied from the makeup water tank 20 to the heat exchanger 21 is adjusted.

  By the way, the water supply tank 7 and the makeup water tank 20 are provided with overflow paths 43 and 44, respectively, for allowing more than a predetermined amount of water to overflow to the outside. Further, the water in the makeup water tank 20 can be drained through the drainage channel 45. A drain valve 46 is provided in the drain channel 45. By controlling the opening and closing of the drain valve 46, the presence or absence of drainage from the makeup water tank 20 is switched. The drain valve 46 is controlled to open and close based on the water temperature in the makeup water tank 20. Specifically, the drain valve 46 is controlled based on the temperature detected by the second temperature sensor 39, and is opened when the temperature exceeds the upper limit temperature, and is closed when the temperature falls below the lower limit temperature.

Next, operation | movement of the boiler water supply system 1 of a present Example is demonstrated.
First, cooling of the lubricating oil in the heat exchanger 21 will be described. For this purpose, the amount of water supplied from the makeup water tank 20 to the heat exchanger 21 is controlled based on the temperature of the lubricating oil supplied from the compressor 5 to the heat exchanger 21. Specifically, the heat supply water pump 40 is controlled by the inverter 41 based on the temperature detected by the first temperature sensor 35 so that the lubricating oil supplied from the compressor 5 to the heat exchanger 21 is maintained at the set temperature. The amount of water supplied from the makeup water tank 20 to the heat exchanger 21 is adjusted. That is, when the temperature of the lubricating oil rises, the rotational speed of the heat exchange water pump 40 is increased to increase the amount of cooling water, while when the temperature of the lubricating oil decreases, the rotational speed of the heat exchange water pump 40 is decreased to reduce the amount of cooling water. Thus, it is possible to maintain the lubricating oil at the set temperature.

  Next, supply of makeup water from the makeup water tank 20 to the water supply tank 7 will be described. During operation of the boiler water supply system 1, the makeup water pump 28 is always operated. In addition, the water level in the water supply tank 7 is monitored by a water level detector 32. When the water in the water supply tank 7 falls below the lower limit water level, the makeup water valve 29 is opened. As a result, the water in the makeup water tank 20 is supplied to the water supply tank 7 via the makeup water channel 27. On the other hand, when the water in the water supply tank 7 exceeds the upper limit water level, the makeup water valve 29 is closed. As a result, the return valve 31 that has been closed until then reaches the valve opening pressure and is opened, and a return path to the makeup water tank 20 through the branch path 30 is secured. Therefore, the water in the makeup water tank 20 is returned to the makeup water tank 20 through the branch path 30 from the middle of the makeup water path 27. In this way, by selectively opening only one of the replenishing water valve 29 and the return valve 31, the presence or absence of water supply from the replenishing water tank 20 to the water supply tank 7 is switched.

  In such a configuration, if the amount of return to the makeup water tank 20 increases too much, the water temperature in the makeup water tank 20 rises. If the water temperature in the makeup water tank 20 rises too much, the water in the makeup water tank 20 may not be suitable for cooling the lubricating oil in the heat exchanger 21. Therefore, the temperature of the water supplied to the heat exchanger 21 is monitored by the second temperature sensor 39 provided in the water supply path 37 from the makeup water tank 20 to the heat exchanger 21, and when the water temperature exceeds the upper limit temperature, The drain valve 46 is opened. As a result, the water in the makeup water tank 20 is discharged through the drainage channel 45, but when the water in the makeup water tank 20 falls to the lower limit water level, the water supply valve 24 is opened to the makeup water tank 20. Water supply will begin. By such water supply / drainage, the water in the makeup water tank 20 is replaced, and when the water in the makeup water tank 20 falls below the lower limit temperature, the drain valve 46 is closed. Thereafter, the water level in the makeup water tank 20 rises, and when the upper limit water level is reached, the water supply valve 24 is closed. As is clear from the installation position of the second temperature sensor 39, the water temperature in the makeup water tank 20 may be monitored in the makeup water tank 20 itself, or from the makeup water tank 20 as in the illustrated example. You may monitor in the water supply path 37 to the heat exchanger 21. FIG.

  According to the boiler water supply system 1 of the present embodiment, energy can be saved by collecting the drain from the steam utilization device 13 to the water supply tank 7. Further, a makeup water tank 20 is provided separately from the water supply tank 7, and the lubricating oil of the compressor 5 can be cooled with water from the makeup water tank 20. By providing the makeup water tank 20 separately from the water supply tank 7, even if drain is collected in the water supply tank 7, the temperature of the water in the makeup water tank 20 is not thereby raised. Thereby, even if the water in the water supply tank 7 is heated by the collected drain, the lubricating oil can be cooled with the water in the makeup water tank 20. Moreover, the lubricating oil can be maintained at a desired temperature by adjusting the amount of water supplied from the heat exchanger water pump 40 to the heat exchanger 21 based on the liquid temperature of the lubricating oil. At this time, the condition (temperature, flow rate) of the lubricating oil supplied to the heat exchanger 21 and the water temperature of the cooling water supplied to the heat exchanger 21 are changed by inverter control of the heat exchange water pump 40. Also, the lubricating oil can be maintained at a desired temperature. Furthermore, since the water in the make-up water tank 20 is supplied to the water supply tank 7, the heat obtained from the lubricating oil can be used effectively.

  FIG. 2 is a schematic diagram illustrating an example of a steam system 2 including the second embodiment of the boiler water supply system 1 of the present invention. The boiler water supply system 1 according to the second embodiment and the steam system 2 including the same are basically the same as the first embodiment. Therefore, in the following description, the differences between the two will be mainly described, and corresponding portions will be described with the same reference numerals.

  The second embodiment is different from the first embodiment in the configuration of the makeup water tank 20. In the second embodiment, the inside of the makeup water tank 20 is divided vertically by a horizontal plate-like partition wall 47 in the middle in the vertical direction. As a result, the interior of the makeup water tank 20 is vertically divided via the partition wall 47, but the upper region and the lower region of the partition wall 47 are partially communicated with each other.

  In this case, the water supply path 23 from the deoxygenation device 11 is connected to a lower region than the partition wall 47, while the drainage channel 45 is connected to an upper region than the partition wall 47. That is, the water supply to the make-up water tank 20 through the water supply valve 24 is performed in a lower region than the partition wall 47, while the water discharged from the make-up water tank 20 through the drain valve 46 is performed from an upper region than the partition wall 47. The

  Further, the water supply path 37 to the heat exchanger 21 is connected to the lower region than the partition wall 47, while the drainage channel 38 from the heat exchanger 21 is connected to the upper region than the partition wall 47. In other words, the water supply from the makeup water tank 20 to the heat exchanger 21 is performed from the lower region than the partition wall 47, while the drainage from the heat exchanger 21 to the makeup water tank 20 is performed to the upper region from the partition wall 47. .

  Further, the replenishment water channel 27 to the water supply tank 7 is connected to the upper region than the partition wall 47, while the branch channel 30 from the replenishment water channel 27 is connected to the upper region than the partition wall 47. That is, the water supply from the makeup water tank 20 to the water supply tank 7 is performed from the upper region than the partition wall 47, and the drainage from the branch passage 30 to the makeup water tank 20 is performed from the partition wall 47 to the upper region.

  In the case of such a configuration, a high temperature region and a low temperature region can be created in the water in the makeup water tank 20 via the partition wall 47. That is, the region above the partition wall 47 is a higher temperature region than the lower region, and the region below the partition wall 47 is a lower temperature region than the upper region. And the comparatively low temperature water supply from the deoxygenation apparatus 11 is performed to a low temperature area | region, while the waste_water | drain to the drainage channel 45 is performed from a high temperature area | region. In addition, water supply to the heat exchanger 21 for cooling the lubricating oil is performed from the low temperature region, while the water warmed by the heat exchanger 21 is returned to the high temperature region. Further, water supply to the water supply tank 7 is performed from the high temperature region, while water return from the branch path 30 is performed to the high temperature region. In this way, it is possible to maintain heat exchange capability and improve system efficiency. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  FIG. 3 is a schematic diagram illustrating an example of a steam system 2 including the boiler feed water system 1 according to the third embodiment of the present invention. The boiler water supply system 1 according to the third embodiment and the steam system 2 including the same are basically the same as the first embodiment. Therefore, in the following description, the differences between the two will be mainly described, and corresponding portions will be described with the same reference numerals.

  The third embodiment is different from the first embodiment in the method for adjusting the amount of cooling water to the heat exchanger 21 based on the liquid temperature of the lubricating oil. That is, in the first embodiment, the heat supply water pump 40 is inverter-controlled based on the temperature detected by the first temperature sensor 35. However, in the third embodiment, the heat pump is configured and controlled as described below.

  In the third embodiment, a temperature control three-way valve 48 is used instead of inverter control of the heat exchange water pump 40. Specifically, the middle of the water supply path 37 from the heat exchanger water pump 40 to the heat exchanger 21 and the middle of the drainage path 38 from the heat exchanger 21 to the makeup water tank 20 are connected by a bypass path 49. Yes. A temperature adjusting three-way valve 48 is provided at a branch portion between the water supply passage 37 and the bypass passage 49. The temperature control three-way valve 48 supplies water from the heat exchange water pump 40 to the heat exchanger 21 based on the temperature detected by the first temperature sensor 35, or via the bypass 49 without passing through the heat exchanger 21. This is an electric three-way valve that adjusts the distribution ratio of returning to the makeup water tank 20.

  In the third embodiment, by controlling the temperature adjusting three-way valve 48, the amount of cooling water supplied to the heat exchanger 21 can be adjusted, and the lubricating oil of the compressor 5 can be maintained at a desired temperature. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  FIG. 4 is a schematic diagram illustrating an example of a steam system 2 including the fourth embodiment of the boiler water supply system 1 of the present invention. The boiler water supply system 1 according to the fourth embodiment and the steam system 2 including the same are basically the same as the second embodiment and the third embodiment. Therefore, in the following description, the differences between the two will be mainly described, and corresponding portions will be described with the same reference numerals.

  In the fourth embodiment, the makeup water tank 20 is configured in the same manner as the second embodiment based on the configuration of the third embodiment. In other words, based on the configuration of the second embodiment, instead of inverter-controlling the heat exchange water pump 40, water is supplied to the heat exchanger 21 by the temperature control three-way valve 48, as in the third embodiment. The amount is adjusted.

  In the fourth embodiment, similarly to the second embodiment, a high temperature region and a low temperature region can be created in the water in the makeup water tank 20 via the partition wall 47. That is, the region above the partition wall 47 is a higher temperature region than the lower region, and the region below the partition wall 47 is a lower temperature region than the upper region. And the comparatively low temperature water supply from the deoxygenation apparatus 11 is performed to a low temperature area | region, while the waste_water | drain to the drainage channel 45 is performed from a high temperature area | region. In addition, water supply to the heat exchanger 21 for cooling the lubricating oil is performed from the low temperature region, while the water warmed by the heat exchanger 21 is returned to the high temperature region. Further, water supply to the water supply tank 7 is performed from the high temperature region, while water return from the branch path 30 is performed to the high temperature region. In this way, it is possible to maintain heat exchange capability and improve system efficiency. Since other configurations are the same as those of the third embodiment, description thereof is omitted.

  FIG. 5 is a schematic diagram illustrating an example of a steam system 2 including the fifth embodiment of the boiler water supply system 1 of the present invention. The boiler water supply system 1 according to the fifth embodiment and the steam system 2 including the same are basically the same as the second embodiment. Therefore, in the following description, the differences between the two will be mainly described, and corresponding portions will be described with the same reference numerals.

  In the fifth embodiment, the drainage channel 45 and the drainage valve 46 are not installed in the configuration of the second embodiment. In this case, when the water temperature in the make-up water tank 20 exceeds the upper limit temperature based on the temperature detected by the second temperature sensor 39, the water supply valve 24 is opened, the high-temperature water is discarded from the overflow path 44, and the make-up water tank 20 The water inside is replaced. When the water in the makeup water tank 20 falls below the lower limit temperature due to such water supply / drainage, the water supply valve 24 is closed. Since other configurations are the same as those of the second embodiment, description thereof is omitted.

  By the way, such replacement of the water in the makeup water tank 20 is not limited to the second embodiment, and can be similarly applied to other embodiments.

  The boiler water supply system 1 of the present invention is not limited to the configuration of each of the embodiments described above and can be changed as appropriate. In particular, it is sufficient if the heat exchanger 21 is used to cool various liquids using the water supplied to the boiler 3, and the configuration of the steam system 2 is not limited to the above embodiments.

  In the above embodiments, the cooling of the compressor 5 driven by the steam engine 4 has been described. However, the present invention can be similarly applied to a conventional compressor driven by electricity.

  Moreover, although the said each Example demonstrated the case where the lubricating oil of the compressor 5 was circulated through the heat exchanger 21, and the cooling of the compressor 5 was aimed at, the boiler water supply system 1 of this invention is the compressor 5 of the compressor 5. Not only for cooling but also for other uses. In that case, a liquid to be cooled may be passed through the heat exchanger 21 instead of the lubricating oil.

  In each of the embodiments, the water levels in the water supply tank 7 and the makeup water tank 20 are detected by the electrostatic capacity type water level detectors 32 and 26, but may be detected by other configurations. For example, you may use the structure which detects the presence or absence of a specific water level by whether the lower end of an electrode rod is immersed in water. In that case, two electrode rods having different height positions at the lower end are used. That is, the opening and closing of the replenishment water valve 29 and the water supply valve 24 are controlled by the two electrode rods of the electrode rod for detecting the lower limit water level and the electrode rod for detecting the upper limit water level.

  In each of the above embodiments, the circulation pump 36 is provided to circulate the lubricating oil between the compressor 5 and the heat exchanger 21. However, the circulation pump 36 is not always necessary. The compressor 5 normally separates compressed air and lubricating oil through an oil separator at the outlet. And the lubricating oil from the compressor 5 is supplied to a heat exchanger via an oil separator. In this case, the lubricating oil is pushed out to the heat exchanger 21 by the internal pressure of the oil separator, while the lubricating oil is returned from the heat exchanger 21 to the compressor 5 by the suction of the compressor 5. As a result, the lubricating oil can be circulated between the compressor 5 and the heat exchanger 21 without the circulation pump 36.

  Further, in each of the above embodiments, the water supply from the makeup water tank 20 to the water supply tank 7 is to selectively open the makeup water valve 29 and the return valve 31 by controlling the opening and closing of the makeup water valve 29. However, other configurations may be adopted. For example, instead of providing the replenishment water valve 29 and the return valve 31, a three-way electromagnetic valve may be provided at the branch portion between the replenishment water passage 27 and the branch passage 30. In this case, the three-way solenoid valve is controlled based on the detection signal of the water level detector 32 to supply water from the makeup water pump 28 to the feed water tank 7 or return to the makeup water tank 20 through the branch path 30. Can be switched. Furthermore, the makeup water valve 29, the branch path 30 and the return valve 31 may be omitted, and the water in the makeup water tank 20 may simply be supplied to the water supply tank 7 via the makeup water path 27 by the makeup water pump 28. In this case, on / off control of the operation of the makeup water pump 28 may be performed based on the detection signal of the water level detector 32.

  Furthermore, in the said Examples 1-4, although it was set as the structure which replaces a part of water in the makeup water tank 20 by opening the drain valve 46 at a desired time, instead of this, a cooling tower and a cooling device can be used at a desired time. The water in the makeup water tank 20 may be circulated between them to cool the water in the makeup water tank 20.

It is the schematic which shows an example of a steam system provided with Example 1 of the boiler water supply system of this invention. It is the schematic which shows an example of a steam system provided with Example 2 of the boiler water supply system of this invention. It is the schematic which shows an example of a steam system provided with Example 3 of the boiler feed water system of this invention. It is the schematic which shows an example of a steam system provided with Example 4 of the boiler water supply system of this invention. It is the schematic which shows an example of a steam system provided with Example 5 of the boiler water supply system of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Boiler water supply system 2 Steam system 3 Boiler 5 Compressor 7 Water supply tank 13 Steam utilization equipment 20 Supply water tank 21 Heat exchanger 22 Drain collection path 24 Water supply valve 26 Water level detector 27 Supply water path 29 Supply water valve 30 Branch path 31 Return Valve 32 Water level detector 33 Supply path 34 Discharge path 35 First temperature sensor 37 Water supply path 38 Drainage path 40 Heat supply water pump 41 Inverter (heat supply water amount adjusting means)
46 Drain valve 47 Bulkhead 48 Temperature controlled three-way valve (heat supply water amount adjustment means)

Claims (6)

A water supply tank that stores water supply to the boiler and collects steam drainage from the boiler;
While storing the water supply to this water supply tank, and provided to be able to supply water to the water supply tank based on the water level in the water supply tank, a replenishment water tank not supplied from the water supply tank,
A heat exchanger through which water to be circulated between the make-up water tank and a liquid to be cooled to be cooled by the circulating water is passed;
A heat supply water pump provided in a water supply path from the makeup water tank to the heat exchanger;
Heat supply water amount adjusting means for adjusting the amount of water supplied from the heat exchange water pump to the heat exchanger based on the liquid temperature of the liquid to be cooled that is passed through the heat exchanger. system. A replenishment water valve provided in a replenishment water path from the replenishment water tank to the water supply tank and opened and closed based on a water level in the water supply tank;
A return valve that is provided in a branch path that branches from the makeup water path from the makeup water tank to the makeup water valve and goes to the makeup water tank, and that is opened by closing the makeup water valve;
The makeup water valve is composed of a solenoid valve,
The return valve is a check valve that opens when the replenishing water valve is closed to reach a valve opening pressure, and allows water from the replenishing water tank to be returned to the replenishing water tank again. The boiler water supply system according to claim 1. The heat supply water amount adjusting means is an inverter that controls the number of rotations of the heat supply water pump based on the liquid temperature of the liquid to be cooled that is passed through the heat exchanger.
The heat exchanger is configured such that water can be circulated with the make-up water tank, and lubricating oil as the liquid to be cooled can be circulated with an oil-lubricated compressor,
The amount of water supplied from the make-up water tank to the heat exchanger is controlled by controlling the heat supply water pump by the inverter so that the lubricating oil supplied from the compressor to the heat exchanger is maintained at a set temperature. It adjusts. The boiler water supply system of Claim 1 or Claim 2 characterized by the above-mentioned. The heat supply water amount adjusting means returns the water from the heat supply water pump to the makeup water tank via the heat exchanger based on the liquid temperature of the liquid to be cooled that is passed through the heat exchanger. , A temperature control three-way valve that adjusts the distribution ratio of whether to return to the makeup water tank without going through the heat exchanger,
The heat exchanger is configured such that water can be circulated with the make-up water tank, and lubricating oil as the liquid to be cooled can be circulated with an oil-lubricated compressor,
Adjusting the amount of water supplied from the makeup water tank to the heat exchanger by controlling the temperature control three-way valve so that the lubricating oil supplied from the compressor to the heat exchanger is maintained at a set temperature. The boiler water supply system according to claim 1 or 2, characterized in that. The makeup water tank can be supplied with water via a water supply valve, and can be discharged with a drain valve.
The water supply valve is opened when the water in the makeup water tank is lower than the lower limit water level, and is closed when the upper limit water level is exceeded,
5. The drain valve is opened when water supplied to the heat exchanger exceeds an upper limit temperature, and is closed when the water falls below a lower limit temperature. 6. Boiler water supply system. The inside of the makeup water tank is divided up and down via a partition wall, but the upper region and the lower region are partly communicated with each other in part from the partition wall,
Water supply to the make-up water tank via the water supply valve is made to a lower region than the partition wall, while water discharge from the make-up water tank through the drain valve is made from an upper region than the partition wall,
Water supply from the makeup water tank to the heat exchanger is made from the lower region than the partition wall, while drainage from the heat exchanger to the makeup water tank is made to the upper region than the partition wall,
The boiler water supply system according to claim 5, wherein water supply from the makeup water tank to the water supply tank is performed from an upper region than the partition wall.

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